423 research outputs found
Sub-40-fs pulses with 18-W average power from a passively mode-locked thin disk Yb:YAG laser with nonlinear fiber compression
No full textBy combining a passively mode-locked high-power laser with a large mode area holey fiber for nonlinear compression, we generated 33-fs pulses with 18-W average power. The output beam is linearly polarized and close to diffraction-limited. ©2002 Optical Society of America.F. Brunner, T. Siidmeyer, E. Innerhofer, R Paschotta, U. Keller, K. Furusawa, J. C. Baggett, T. M. Monro, and D. J. Richardso
Polarization mode dispersion reduction in spun silica holey fibres
No full textWe report the fabrication of a spun holey optical fibre. Our experiments show that the complex air/glass transverse structure can be retained when the preform is spun during the fibre drawing process. Measurements of differential group delay (DGD) confirm that significant reductions in polarization mode dispersion (PMD) can be readily achieved using this approach
Mode area limits in practical single-mode fibers
No full textThe upper limits imposed by bend loss on practical mode size in single-mode holey and step-index fibers are identified for a range of wavelengths. Using these results we quantify the advantages offered by holey fibers
Structure and propagation of modes of large mode area holey fibres
No full textThe authors report on the first demonstration of optical fibres based on the Ga:La:S system. Core-clad structures have been fabricated by the rod and tube method and pulled into lengths > 200m. Transmission over the wavelength range 1.0 to 6.5 µm, with fibre loss approaching the absorption and scattering level of the bulk glass, is obtained, opening the possibility of new fibre device applications of this promising glass host
Birmingham News sleeve BN0032419
No full textSoftball managers / C. Moore / L. Baggett / F. Neely / Photo of the managers of the final three teams in softball tournament / Dixie Sporting Goods - Charlie Moore / McCullough chain saw - Luke Baggett / J&M Industries - #14 Frank Neely / Get 'em looking over trophy, maybe / Green Springs Park / [Work order included
Advances in holey fibers
No full textThe combination of wavelength-scale features and design flexibility offered by holey fibers leads to a significantly broader range of optical properties than is possible in conventional optical fibers. Of particular interest, holey fibers offer the combination of broadband single mode guidance and large mode areas, and such fibers are promising for high power delivery applications such as including laser welding and machining, and for fiber lasers and amplifiers. Holey fiber technology has now reached the point that km- lengths of polymer-coated fiber with less than 1dB/km loss at 1550nm are possible. As well as being of fundamental scientific interest, the novel guidance properties of holey fibers can be exploited to develop technologically important devices. Here recent advances in holey fibers will be presented, with a particular focus on recent results in developing holey fiber-based lasers
Cotton Picking Glove.
No full textPatent for a cotton picking glove, which allows full movement of the fingers and has easily replaceable tips
UV generation in a pure-silica holey fiber
No full textWe report supercontinuum generation extending to 300nm in the UV from a pure-silica holey fiber. The broad spectrum was obtained by launching ultra-short pulses (~150fs, 10nJ at 820nm) from an amplified Ti:sapphire laser. The extension of holey-fiber-based supercontinuum generation into the UV should prove to be of immediate application in spectroscopy. By slightly detuning the launch conditions we excited a higher order spatial mode, which produced a narrower supercontinuum, but with enhanced conversion efficiency at a series of blue/UV peaks around 360nm. We present numerical simulations, which suggest that differences in the dispersion profiles between the modes are an important factor in explaining this enhancement. In a related experiment, using the same laser source and fiber, we demonstrate a visible supercontinuum from several subsidiary cores, with distinct colours in each core. The subsidiary cores were excited by an appropriate input coupling. Fabrication of a fiber with a range of core sizes (dispersion profiles) for tailored supercontinuum generation can therefore be envisaged for practical applications
College Park Neighborhood Analysis Report, May 27, 1976
No full textReport from McMillan C. Baggett, then-Senior Staff Consultant of Public Research and Management, addressed to City Attorney George A. Glaze containing detailed statistics regarding College Park's neighborhood analysis and ward breakdown. According to the author, the provided housing data was accurate, while population estimates were based on vacancy rates and occupancy rates. Minority population estimates were difficult to obtain, and the figures presented were only approximations. 5 pages
Instrument Science Report
No full textThis report describes preliminary calibration of the FOC polarizing filters. The approximate position angles of the filters were determined to be as follows. The POL0 filter passes light with electric vector parallel to the sample direction. The POL60 polarization direction is 60 ffi counterclockwise from POL0, as projected onto the sky, and the POL120 polarization direction is 120 ffi counterclockwise from POL0 as projected onto the sky. These position angles should be correct to within 10 ffi , and more accurate values will be obtained by further analysis of existing data. Additional observations will be needed to measure the image shifts and the relative throughputs of the polarizing filters. 0 DISTRIBUTION: FOC Project: D. Eaton, B. G. Taylor, R. Thomas, N. Towers IDT: entire FOC IDT TIB: D. Baxter, J. C. Blades, C. Cox, P. Greenfield, W. Hack, R. Jedrzejewski, A. Nota, F. Paresce, W. Sparks, All Instrument Scientists SCARS: D. Bazell, D. Gilmore, P. Hodge SESD: W. Baggett,..
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